These points are also on the negative side of the x axis, at -pi/4 and -pi/2. When we move along the x axis, notice what happens to the y value. On the left side of zero, tangent is negative. At x=-pi/4, tangent=-1.
The Independent Online. David Cameron may have called a referendum on the EU to blackmail Europe, according to Vladimir Putin. The Russian president also questioned Mr Cameronâs decision to call the vote, as it has caused a âgreat problemâ.
Yanukovych Calls for Donbass Status Referendum if Kiev Fails Minsk Deal. Ex-President of Ukraine Viktor Yanukovych wrote a letter to Russian President Vladimir Putin, US President Donald Trump, German Chancellor Angela Merkel, French President Francois Hollande, Polish President Andrzej Duda, as well as the heads of European bodies.